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[英]How can I subtract the values in one row from the values in another row in the same mysql table
[英]MySQL - change time values of one row to match time values of another row of the same table
我有幾位顧問記錄他們的工作開始/結束時間。 因為他們有兩個小時的最低收費,所以我需要確保正確計算他們的工作時間。 當他們在同一站點上有連續的作業,而作業之間的空閑時間介於15到60分鍾之間時,就會出現問題。
以下是按cid,job_date,start_time排序的示例表的查詢結果。 對於此特定示例,所有作業時間條目都在同一天:
id job_num cid job_date start_time end_time
19 130513-20 6 05/13/2013 2013-05-13 13:30:00 2013-05-13 16:30:00
10 130513-10 7 05/13/2013 2013-05-13 11:00:00 2013-05-13 13:00:00
16 130513-17 13 05/13/2013 2013-05-13 14:45:00 2013-05-13 15:30:00
15 130513-16 16 05/13/2013 2013-05-13 14:45:00 2013-05-13 16:15:00
18 130513-19 34 05/13/2013 2013-05-13 11:15:00 2013-05-13 12:15:00
8 130513-08 44 05/13/2013 2013-05-13 12:00:00 2013-05-13 14:30:00
6 130513-06 47 05/13/2013 2013-05-13 11:00:00 2013-05-13 12:00:00
9 130513-09 47 05/13/2013 2013-05-13 12:00:00 2013-05-13 12:30:00
14 130513-15 47 05/13/2013 2013-05-13 14:30:00 2013-05-13 15:15:00
3 130513-03 50 05/13/2013 2013-05-13 09:00:00 2013-05-13 10:45:00
7 130513-07 50 05/13/2013 2013-05-13 11:00:00 2013-05-13 12:00:00
11 130513-11 50 05/13/2013 2013-05-13 13:00:00 2013-05-13 14:30:00
17 130513-18 50 05/13/2013 2013-05-13 15:00:00 2013-05-13 16:15:00
2 130513-02 52 05/13/2013 2013-05-13 09:30:00 2013-05-13 10:30:00
4 130513-04 52 05/13/2013 2013-05-13 10:30:00 2013-05-13 11:00:00
5 130513-05 52 05/13/2013 2013-05-13 11:00:00 2013-05-13 13:00:00
12 130513-12 52 05/13/2013 2013-05-13 14:00:00 2013-05-13 14:45:00
13 130513-13 52 05/13/2013 2013-05-13 15:00:00 2013-05-13 17:00:00
20 130513-21 61 05/13/2013 2013-05-13 11:00:00 2013-05-13 12:00:00
1 130513-01 70 05/13/2013 2013-05-13 14:30:00 2013-05-13 15:15:00
我要完成的工作是更新特定行(job_num)的end_time,以使其等於同一顧問(cid)的查詢中下一個job_num的end_time,但前提是兩者之間存在差異(空閑時間)從第一個作業的結束時間到下一個作業的開始時間之間的時間<= 30分鍾。 基本上,我想在比較中將空閑時間添加到第一個作業的end_time中。
例如:
id job_num cid job_date start end
3 130513-03 50 05/13/2013 2013-05-13 09:00:00 2013-05-13 10:45:00 <-- original
7 130513-07 50 05/13/2013 2013-05-13 11:00:00 2013-05-13 12:00:00
11 130513-11 50 05/13/2013 2013-05-13 13:00:00 2013-05-13 14:30:00 <-- original
17 130513-18 50 05/13/2013 2013-05-13 15:00:00 2013-05-13 16:15:00
...
12 130513-12 52 05/13/2013 2013-05-13 14:00:00 2013-05-13 14:45:00 <-- original
13 130513-13 52 05/13/2013 2013-05-13 15:00:00 2013-05-13 17:00:00
成為:
3 130513-03 50 05/13/2013 2013-05-13 09:00:00 2013-05-13 11:00:00 <-- changed
7 130513-07 50 05/13/2013 2013-05-13 11:00:00 2013-05-13 12:00:00
11 130513-11 50 05/13/2013 2013-05-13 13:00:00 2013-05-13 15:00:00 <-- changed
17 130513-18 50 05/13/2013 2013-05-13 15:00:00 2013-05-13 16:15:00
...
12 130513-12 52 05/13/2013 2013-05-13 14:00:00 2013-05-13 15:00:00 <-- changed
13 130513-13 52 05/13/2013 2013-05-13 15:00:00 2013-05-13 17:00:00
我將如何進行此更改? 我已經看到了使用臨時表和變量來解決類似問題的解決方案,這些臨時表和變量非常適合檢查時差,但都不能(根據我對MySQL查詢的了解)適應我的特定問題。 我也將此問題標記為PHP,因為用PHP這樣做可能會更簡單。
任何幫助將不勝感激!
我假設id
是表的Primary Key
,並且是AUTO-INCREMENT
ing。
我有此UPDATE
查詢:
UPDATE table T1
SET T1.end_time = (
SELECT T2.end_time
FROM table T2
WHERE T2.cid = T1.cid
AND T2.job_date = T1.job_date
AND T2.id > T1.id
AND T2.start_time <= DATE_ADD(T1.end_time, INTERVAL 30 MINUTE)
ORDER BY T2.id ASC
LIMIT 1
)
WHERE id IN (
SELECT DISTINCT T1.Id
FROM table T1
INNER JOIN table T2 ON T2.cid = T1.cid
AND T2.job_date = T1.job_date
AND T2.id > T1.id
AND T2.start_time <= DATE_ADD(T1.end_time, INTERVAL 30 MINUTE)
WHERE T1.job_date = @date
);
雖然有點復雜,但效率不高。 但是由於這只是一個查詢,我想您將需要每次(每天/每周/等等)更新end_time
。
並確保設置@date
變量的值,或者可以將其替換為所需的日期。
我認為使用CURSOR
(這很慢)比上面的查詢更有效。
這是一個CURSOR
查詢示例:
DECLARE id INT(11);
DECLARE newEndDate DATETIME;
DECLARE noMoreRows BIT(1);
DECLARE customCursor CURSOR FOR
SELECT T1.Id
, CAST(SUBSTRING_INDEX(GROUP_CONCAT(T2.start_date ORDER BY T2.Id ASC), ',', 1) AS DATETIME) AS NewEndDate
FROM table T1
INNER JOIN table T2 ON T2.cid = T1.cid
AND T2.job_date = T1.job_date
AND T2.id > T1.id
AND T2.start_time <= DATE_ADD(T1.end_time, INTERVAL 30 MINUTE)
WHERE T1.job_date = @date
GROUP BY T1.Id
HAVING NewEndDate <> '' OR NewEndDate IS NOT NULL;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET noMoreRows = 1;
OPEN customCursor;
customLoop: LOOP
FETCH customCursor INTO id, newEndDate;
IF noMoreRows THEN
LEAVE customLoop;
END IF;
UPDATE table
SET end_date = newEndDate
WHERE id = id;
END LOOP customLoop;
CLOSE customCursor;
只需注意CURSOR
應該在STORED PROCEDURE
。 這是CURSORS
的鏈接 。
我假設您正在使用php格式化開始時間和結束時間,然后插入數據庫表中。
$start = date("Y-m-d H:i:s",time());
$query = "select * from table name where cid = $cid and UNIX_TIMESTAMP($start) - UNIX_TIMESTAMP(end_time) <= 1800";
mysqli_query($con,$query);
if ($result=mysqli_query($con,$query))
{
$rowcount=mysqli_num_rows($result);
if($rowcount > 1)
{
$row = mysqli_fetch_array($result, MYSQLI_ASSOC);
query2 = "update tablename set end_time = '$start' where id = '$row['id']'";
query3 = "insert into tablename(cid,date,start_time,end_time) values($cid,$date,$start,$end)";
}else{
//do the insert as such
query2 = "insert into tablename(cid,date,start_time,end_time) values($cid,$date,$start,$end)";
}
mysqli_free_result($result);
}
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